Will, in philosophy, refers to a property of the mind, and an attribute of acts intentionally performed. Actions made according to a person's will are called “willing” or “voluntary” and sometimes pejoratively “willful” or “at will”. In general, "will" does not refer to one particular or most preferred desire but rather to the general capacity to have such desires and act decisively based on them, according to whatever criteria the willing agent applies. The will is in turn important within philosophy because a person's will is one of the most distinct parts of their mind, along with reason and understanding. It is one of the things which makes a person who they are, and it is especially important in ethics, because it is the part which determines whether people act, at least when they act deliberately.
One of the repeating questions discussed in the Western philosophical tradition since Christianization is the question of "free will", and the related but more general notion of fate, which asks how will can be truly free if the actions of people have natural or divine causes which determine them, but which are not really under the control of people. The question is directly connected to discussions of what Freedom is, and also the "problem of evil", because it brings into question whether people really cause their own acts.
Classical philosophy 
The classical treatment of the ethical importance of will is to be found in the Nicomachean Ethics of Aristotle, in Books III (chapters 1-5), and Book VII (chapters 1-10). These discussions have been a major influence in the development of ethical and legal thinking in western civilization.
In Book III Aristotle divided actions into three categories instead of two:
- Voluntary (ekousion) acts.
- Involuntary or unwilling (akousion) acts, which are in the simplest case where people do not praise or blame. In such cases a person does not choose the wrong thing, for example if the wind carries a person off, or if a person has a wrong understanding of the particular facts of a situation. Note that ignorance of what aims are good and bad, such as people of bad character always have, is not something people typically excuse as ignorance in this sense. "Acting on account of ignorance seems different from acting while being ignorant".
- "Non-voluntary" or "non willing" actions (ouk ekousion) which are bad actions done by choice, or more generally (as in the case of animals and children when desire or spirit causes an action) whenever "the source of the moving of the parts that are instrumental in such actions is in oneself" and anything "up to oneself either to do or not". However, these actions are not taken because they are preferred in their own right, but rather because all options available are worse.
It is concerning this third class of actions that there is doubt about whether they should be praised or blamed or condoned in different cases.
Virtue and vice according to Aristotle are "up to us". This means that although no one is willingly unhappy, vice by definition always involves actions which were decided upon willingly. Vice comes from bad habits and aiming at the wrong things, not deliberately aiming to be unhappy. The vices then, are voluntary just as the virtues are. He states that people would have to be unconscious not to realize the importance of allowing themselves to live badly, and he dismisses any idea that different people have different innate visions of what is good.
In Book VII, Aristotle discusses self-mastery, or the difference between what people decide to do, and what they actually do. For Aristotle, akrasia, "unrestraint", is distinct from animal-like behavior because it is specific to humans and involves conscious rational thinking about what to do, even though the conclusions of this thinking are not put into practice. When someone behaves in a purely animal-like way, then for better or worse they are not acting based upon any conscious choice.
Aristotle also addresses a few questions raised earlier, on the basis of what he has explained:-
- Not everyone who stands firm on the basis of a rational and even correct decision has self-mastery. Stubborn people are actually more like a person without self-mastery, because they are partly led by the pleasure coming from victory.
- Not everyone who fails to stand firm on the basis of his best deliberations has a true lack of self mastery. As an example he gives the case of Neoptolemus (in Sophocles' Philoctetes) refusing to lie despite being part of a plan he agreed with.
- A person with practical wisdom (phronesis) can not have akrasia. Instead it might sometimes seem so, because mere cleverness can sometimes recite words which might make them sound wise, like an actor or a drunk person reciting poetry. A person lacking self-mastery can have knowledge, but not an active knowledge that they are paying attention to. For example when someone is in a state such as being drunk or enraged, people may have knowledge, and even show that they have that knowledge, like an actor, but not be using it.
Medieval European philosophy 
Inspired by Islamic philosophers Avicenna and Averroes, Aristotelian philosophy became part of a standard approach to all legal and ethical discussion in Europe by the time of Thomas Aquinas. His philosophy can be seen as a synthesis of Aristotle and early Christian doctrine as formulated by Boethius and Augustine of Hippo, although sources such as Maimonides and Plato and the aforementioned Muslim scholars are also cited.
- Does the will desire nothing? (No.)
- Does it desire all things of necessity, whatever it desires? (No.)
- Is it a higher power than the intellect? (No.)
- Does the will move the intellect? (Yes.)
- Is the will divided into irascible and concupiscible? (No.)
- Does man have free-will? (Yes.)
- What is free-will—a power, an act, or a habit? (A power.)
- If it is a power, is it appetitive or cognitive? (Appetitive.)
- If it is appetitive, is it the same power as the will, or distinct? (The same, with contingencies).
Early modern philosophy 
The use of English in philosophical publications began in the early modern period, and therefore the English word "will" became a term used in philosophical discussion. During this same period, Scholasticism, which had largely been a Latin language movement, was heavily criticized. Both Francis Bacon and René Descartes described the human intellect or understanding as something which needed to be considered limited, and needing the help of a methodical and skeptical approach to learning about nature. Bacon emphasized the importance analyzing experience in an organized way, for example experimentation, while Descartes, seeing the success of Galileo in using mathematics in physics, emphasized the role of methodical reasoning as in mathematics and geometry. Descartes specifically said that error comes about because the will is not limited to judging things which the understanding is limited to, and described the possibility of such judging or choosing things ignorantly, without understanding them, as free will.
Under the influence of Bacon and Descartes, Thomas Hobbes made one of the first attempts to systematically analyze ethical and political matters in a modern way. He defined will in his Leviathan Chapter VI, in words which explicitly criticize the medieval scholastic definitions:
In deliberation, the last appetite, or aversion, immediately adhering to the action, or to the omission thereof, is that we call the will; the act, not the faculty, of willing. And beasts that have deliberation, must necessarily also have will. The definition of the will, given commonly by the Schools, that it is a rational appetite, is not good. For if it were, then could there be no voluntary act against reason. For a voluntary act is that, which proceedeth from the will, and no other. But if instead of a rational appetite, we shall say an appetite resulting from a precedent deliberation, then the definition is the same that I have given here. Will therefore is the last appetite in deliberating. And though we say in common discourse, a man had a will once to do a thing, that nevertheless he forbore to do; yet that is properly but an inclination, which makes no action voluntary; because the action depends not of it, but of the last inclination, or appetite. For if the intervenient appetites, make any action voluntary; then by the same reason all intervenient aversions, should make the same action involuntary; and so one and the same action, should be both voluntary and involuntary.
By this it is manifest, that not only actions that have their beginning from covetousness, ambition, lust, or other appetites to the thing propounded; but also those that have their beginning from aversion, or fear of those consequences that follow the omission, are voluntary actions.
Concerning "free will", most early modern philosophers, including Hobbes, Spinoza, Locke and Hume believed that the term was frequently used in a wrong or illogical sense, and that the philosophical problems concerning any difference between "will" and "free will" are due to verbal confusion (because all will is free):
a FREEMAN, is he, that in those things, which by his strength and wit he is able to do, is not hindered to do what he has a will to. But when the words free, and liberty, are applied to any thing but bodies, they are abused; for that which is not subject to motion, is not subject to impediment: and therefore, when it is said, for example, the way is free, no liberty of the way is signified, but of those that walk in it without stop. And when we say a gift is free, there is not meant any liberty of the gift, but of the giver, that was not bound by any law or covenant to give it. So when we speak freely, it is not the liberty of voice, or pronunciation, but of the man, whom no law hath obliged to speak otherwise than he did. Lastly, from the use of the word free-will, no liberty can be inferred of the will, desire, or inclination, but the liberty of the man; which consisteth in this, that he finds no stop, in doing what he has the will, desire, or inclination to do.."
Spinoza argues that seemingly "free" actions aren't actually free, or that the entire concept is a chimera because "internal" beliefs are necessarily caused by earlier external events. The appearance of the internal is a mistake rooted in ignorance of causes, not in an actual volition, and therefore the will is always determined. Spinoza also rejects teleology, and suggests that the causal nature along with an originary orientation of the universe is everything we encounter.
Some generations later, David Hume made a very similar point to Hobbes in other words:
But to proceed in this reconciling project with regard to the question of liberty and necessity; the most contentious question of metaphysics, the most contentious science; it will not require many words to prove, that all mankind have ever agreed in the doctrine of liberty as well as in that of necessity, and that the whole dispute, in this respect also, has been hitherto merely verbal. For what is meant by liberty, when applied to voluntary actions? We cannot surely mean that actions have so little connexion with motives, inclinations, and circumstances, that one does not follow with a certain degree of uniformity from the other, and that one affords no inference by which we can conclude the existence of the other. For these are plain and acknowledged matters of fact. By liberty, then, we can only mean a power of acting or not acting, according to the determinations of the will; that is, if we choose to remain at rest, we may; if we choose to move, we also may. Now this hypothetical liberty is universally allowed to belong to every one who is not a prisoner and in chains. Here, then, is no subject of dispute.
Jean-Jacques Rousseau added a new type of will to those discussed by philosophers, which he called the "General will" (volonté générale). This concept developed from Rousseau's considerations on the social contract theory of Hobbes, and describes the shared will of a whole citizenry, whose agreement is understood to exist in discussions about the legitimacy of governments and laws.
Kant's Transcendental Idealism claimed that "all objects are mere appearances [phenomena]." He asserted that "nothing whatsoever can ever be said about the thing in itself that may be the basis of these appearances." Kant's critics responded by saying that Kant had no right, therefore, to assume the existence of a thing in itself.
Schopenhauer disagreed with Kant's critics and stated that it is absurd to assume that phenomena have no basis. Schopenhauer proposed that we cannot know the thing in itself as though it is a cause of phenomena. Instead, he said that we can know it by knowing our own body, which is the only thing that we can know at the same time as both a phenomenon and a thing in itself.
When we become conscious of ourself, we realize that our essential qualities are endless urging, craving, striving, wanting, and desiring. These are characteristics of that which we call our will. Schopenhauer affirmed that we can legitimately think that all other phenomena are also essentially and basically will. According to him, will "is the innermost essence, the kernel, of every particular thing and also of the whole. It appears in every blindly acting force of nature, and also in the deliberate conduct of man…." Schopenhauer said that his predecessors mistakenly thought that the will depends on knowledge. According to him, though, the will is primary and uses knowledge in order to find an object that will satisfy its craving. That which, in us, we call will is Kant's "thing in itself", according to Schopenhauer.
Arthur Schopenhauer put the puzzle of free will and moral responsibility in these terms:
Everyone believes himself a priori to be perfectly free, even in his individual actions, and thinks that at every moment he can commence another manner of life. ... But a posteriori, through experience, he finds to his astonishment that he is not free, but subjected to necessity, that in spite of all his resolutions and reflections he does not change his conduct, and that from the beginning of his life to the end of it, he must carry out the very character which he himself condemns...
In his On the Freedom of the Will, Schopenhauer stated, "You can do what you will, but in any given moment of your life you can will only one definite thing and absolutely nothing other than that one thing."
Friedrich Wilhelm Nietzsche was influenced by Schopenhauer when younger, but later felt him to be wrong. However, he maintained a modified focus upon will, making the term "will to power" famous as an explanation of human aims and actions.
Idealism: Will as all 
In idealist models of reality, the material world is either non-existent or is a secondary artifact of the "true" world of ideas. In such worlds, it can be said that everything is an act of will. Even if you are arrested by the police, this is actually an act of your will, too; if you didn't want it to happen, you could have decided otherwise. This line of thought is seen among proponents of a spiritual or mystical universe such as Carlos Castaneda, the New Thought writers Frank Channing Haddock (The Power of Will) and William Walker Atkinson (Personal Power Volume V: Will Power).
The concept of Will is especially important to certain Hermetic and esoteric traditions, particularly in the West and those mystical practices associated with European ideology. Perhaps most notably, the concept takes on an essential role as the philosophical-spiritual basis of Thelema (and its various delineations), an occultic system of thought developed by the writer-mystic Aleister Crowley: Crowley argued that Will provides for a certain ground of being, as well as the possibility that rituals such as ceremonial magic, yoga, and meditation allow for conscious beings to have direct influence over reality and both the spiritual and metaphysical world. Important to Thelema (the term itself meaning "will") is the notion of a difference between mundane "will" and True Will, the latter of which is the purposed fulfillment of human beings through a process of [largely esoteric] methods employed to achieve self-realization.
Psychologists also deal with issues of will and "willpower" the ability to affect will in behavior; some people are highly intrinsically motivated and do whatever seems best to them, while others are "weak-willed" and easily suggestible (extrinsically motivated) by society or outward inducement. Apparent failures of the will and volition have also been reported associated with a number of mental and neurological disorders. They also study the phenomenon of Akrasia, wherein people seemingly act against their best interests and know that they are doing so (for instance, restarting cigarette smoking after having intellectually decided to quit). Advocates of Sigmund Freud's psychology stress the importance of the influence of the unconscious mind upon the apparent conscious exercise of will. Abraham Low, a critic of psychoanalysis, stressed the importance of will, the ability to control thoughts and impulses, as fundamental for achieving mental health.
See also 
- Categorical imperative
- God's will
- Neuroscience of free will
- World as Will and Representation
Further reading 
- St. Augustine (1993). On Free Choice of the Will. Hackett Pub. Co. ISBN 0-87220-188-0.
- Dorschel, Andreas, 'The Authority of Will', The Philosophical Forum XXXIII (2002), nr. 4, pp. 425–441.
- Luther, Martin (1990). The Bondage of the Will (in German). Revell. ISBN 0-8007-5342-9.
- Nietzsche, Friedrich (1968) . The Will to Power (in German). Vintage. ISBN 0-394-70437-1.
- Norwood, Rick. The Evolution of the Will. Philosophy in Science, Vol 6.
- "SUMMA THEOLOGICA: The will (Prima Pars, Q. 82)". Newadvent.org. Retrieved 2012-11-07.
- "SUMMA THEOLOGICA: Free-will (Prima Pars, Q. 83)". Newadvent.org. Retrieved 2012-11-07.
- Meditation IV: Concerning the True and the False
- Hobbes, T. (1651) Leviathan CHAPTER XXI.: "Of the liberty of subjects" (1968 edition). London: Penguin Books.
- Hume, D. (1740). A Treatise of Human Nature SECTION VIII.: "Of liberty and necessity" (1967 edition). Oxford University Press, Oxford. ISBN 0-87220-230-5
- Critique of Pure Reason, A 49. At end of "General Observations on Transcendental Aesthetic," p. 39 of Müller's translation. Also B 63: "…as the external sense gives us nothing but representations of relations, that sense can contain in its representations only the relation of an object to the subject, and not what is inside the object by itself. The same applies to internal intuition."
- Critique of Pure Reason, A 49.
- The World as Will and Representation, vol. I, § 21
- Schopenhauer, Arthur, The Wisdom of Life, p 147
- Schopenhauer, Arthur, On the Freedom of the Will, Oxford: Basil Blackwell ISBN 0-631-14552-4
- Berrios, G.E.; Gili, M. (1995). "Will and its disorders. A conceptual history". History of Psychiatry 6: 87–104.
- Berrios, G.E.; Gili, M. (1995). "Abulia and impulsiveness revisited". Acta Psychiatrica Scandinavica 92: 161–167.
- Sagarin, Edward (1969). "Chapter 9. Mental patients: are they their brothers' therapists?". Odd Man In: Societies of Deviants in America. Chicago, Illinois: Quadrangle Books. pp. 210–232. ISBN 0-531-06344-5. OCLC 34435.
- Wechsler, Henry (April 1960). "The self-help organization in the mental health field: Recovery, Inc., a case study". The Journal of Nervous and Mental Disease 130: 297–314. doi:10.1097/00005053-196004000-00004. ISSN 0022-3018. OCLC 13848734. PMID 13843358.
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.
- Critique of Pure Reason
- The World as Will and Representation, vol. 1, Dover edition, 1966, ISBN 0-486-21761-2
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- Autistics may not experience will as we understand it
- Stanford Encyclopedia of Philosophy Free Will entry
- The Will Project was a project proposed by Roberto Assagioli to explore all aspects and manifestations of the Will.
- Willpower: It’s in Your Head NYT Article summarizing some recent psychological positions and results.